Iron-based photocatalytic and photoelectrocatalytic nano-structures: Facts, perspectives, and expectations

AlSalka, Yamen; Granone, Luis I.; Ramadan, Wegdan; Hakki, Amer; Dillert, Ralf; Bahnemann, Detlef W.

doi:10.1016/j.apcatb.2018.12.014

Cited by 111 publications

(51 citation statements)

References 259 publications

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“…After their formation, the carboxylic acids remained in solution because they are very slowly degraded. This result agrees with previous reports that carboxylic acids are hardly oxidized by hvb + and  OH but are biodegradable [16,40].…”

Section: Photoelectrocatalytic Mineralization and Time-course Of Yielsupporting

confidence: 93%

“…Applying a bias potential enhances the charge carrier separation and diminishes the extent of recombination (Equation (3)) [2,43], which increases the half-life of the oxidants photogenerated on the photoanode surface [13,44]. Moreover, the evolution of O2 on the anode surface may contribute to selective scavenging ecb − through Equation 6, which yields superoxide radical (O2 − ) [16,45]. Yielded O2 − is a weaker oxidant with E° = 0.94 V versus a standard hydrogen electrode (SHE) [46], which may contribute to the acetaminophen degradation by (i) selective oxidation of organics and (ii) enhances charge carriers' stability.…”

Section: Acetaminophen Degradation By Photocatalysis Electrocatalysimentioning

confidence: 99%

“…Applying a constant cell potential (E cell ) promotes extraction of photo-excited e cb − through an external electrical circuit in an electrochemically-driven process [2]. The E cell defines the efficient transport and consequent charge carrier separation in the photoelectrocatalytic system [16,47]. Thus, impacts on photoelectrocatalytic k 1 were studied by varying applied E cell while maintaining a constant photon flux.…”

Section: Influence Of Applied Cell Potential On Reactor Performancementioning

confidence: 99%

“…The main contribution of the electrochemically-driven component in the photoelectrocatalytic process is to diminish the extent and even avoid recombination [14,15]. This is achieved by imposing a difference of potential during photoexcitation to induce separation of photogenerated charge carriers [2,16].…”

Section: Introductionmentioning

confidence: 99%

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Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen

Montenegro-Ayo

Morales-Gomero

Alarcón

et al. 2019

Water

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Multiple discs coated with hierarchically-organized TiO2 anatase nanotubes served as photoelectrodes in a novel annular photoelectrocatalytic reactor. Electrochemical characterization showed light irradiation enhanced the current response due to photogeneration of charge carriers. The pharmaceutical acetaminophen was used as a representative water micropollutant. The photoelectrocatalysis pseudo-first-order rate constant for acetaminophen was seven orders of magnitude greater than electrocatalytic treatment. Compared against photocatalysis alone, our photoelectrocatalytic reactor at <8 V reduced by two fold, the electric energy per order (EEO; kWh m−3 order−1 for 90% pollutant degradation). Applying a cell potential higher than 8 V detrimentally increased EEO. Acetaminophen was degraded across a range of initial concentrations, but absorbance at higher concentration diminished photon transport, resulting in higher EEO. Extended photoelectrocatalytic reactor operation degraded acetaminophen, which was accompanied by 53% mineralization based upon total organic carbon measurements. This proof of concept for our photoelectrocatalytic reactor demonstrated a strategy to increase photo-active surface area in annular reactors.

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Section: Photoelectrocatalytic Mineralization and Time-course Of Yielsupporting

confidence: 93%

Section: Acetaminophen Degradation By Photocatalysis Electrocatalysimentioning

confidence: 99%

Section: Influence Of Applied Cell Potential On Reactor Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen

Montenegro-Ayo

Morales-Gomero

Alarcón

et al. 2019

Water

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show abstract

“…Therefore, studies devoted to this area are relatively trivial, in which earth‐abundant metal oxides such as ZnO, TiO 2 , SiO 2 , and Fe 2 O 3 are usually exploited in the development of new electrodes for sunlight‐assisted water splitting 5–8 . Among them, hematite nanoceramics (α‐Fe 2 O 3 ) stands out when it is desired to have cheap and efficient electrodes for PEC, being the focus of several works and review papers 9–15 …”

Section: Introductionmentioning

confidence: 99%

Revealing the synergy of Sn insertion in hematite for next‐generation solar water splitting nanoceramics

Bedin

Freitas

Tofanello

et al. 2020

Int J Ceramic Engine & Sci

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Solar water splitting-driven hydrogen fuel production is very attractive due to positive aspects as higher energy density and a renewable energy source arising from water and sunlight. 1 Despite these remarkable overall strengths, sustainable largescale clean hydrogen production is quite far from being available, in particular by the lack of efficient and economically viable electrodes for photoelectrochemical (PEC) cells. These devices involve two redox electrochemical reactions: hydrogen evolution on the cathode and oxygen evolution on the anode, where one or more photosensitive material can be enforced in the device design. 2 It is worth mentioning that oxygen evolution reaction (OER) is the rate-determining step of the photoelectrochemical water splitting, because of the four-electron reaction mechanism of water oxidation, which

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Electrochemical and Photoelectrochemical Water Splitting: Operando Raman and Fourier Transform Infrared Spectroscopy as Useful Probing Techniques

et al. 2023

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The urgent need for the clean energy transition of our society is the incentive for the scientific research groups to further advance the development of green hydrogen production. The field of (photo)electrochemical water splitting is currently experiencing a significant expansion of scientific investigations. Despite the technological and material development brought by this technique, the complex reaction mechanisms on the surface of (photo)electrodes during water splitting have led to considerable scientific questions and many contradictions to theoretical expectations. Therefore, a deeper tracking of the surface‐active centers, the experimental reaction mechanisms, and the nature of intermediates requires the use of in situ spectroscopic techniques. In this review, operando Raman and Fourier transform infrared (FTIR) spectroscopies in the field of (photo)electrochemical water splitting are presented. In the first section, the environmental challenges and possible solutions are discussed, and then the principle of vibrational spectroscopy and its applications in the field of (photo)catalysis are presented in detail. In the second part, the recent results of operando Raman and FTIR techniques for (photo)electrochemical water splitting, including challenges and reaction mechanisms, are reviewed. To simplify the presentation, the results are subdivided according to the materials used as (photo)electrodes.

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Iron-based photocatalytic and photoelectrocatalytic nano-structures: Facts, perspectives, and expectations

Cited by 111 publications

References 259 publications

Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen

Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen

Revealing the synergy of Sn insertion in hematite for next‐generation solar water splitting nanoceramics

Electrochemical and Photoelectrochemical Water Splitting: Operando Raman and Fourier Transform Infrared Spectroscopy as Useful Probing Techniques

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